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Modified files:
usr.sbin/smtpd : mail.file.c mail.lmtp.c mail.maildir.c
Log message:
at the exception of mail.local, smtpd never executes an MDA as root.
the check is performed daemon-side before even forking the child process,
but let's also check euid in the mda we ship in case someone executes them
by hand and needs to see an explicit error message.